Fill in NOTES.md write-up

Answers the plan/model/commits/review questions for the grading check.

Author: MykhailoIvchenko

NOTES.md

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+What was in the plan you approved, and did you edit anything before approving?
+The plan contained info about existing functions, their usage, files that should be changed. I haven't edited anything.
+
+Which model did you choose, and why?
+I chose the Sonnet model as it is not routine task but is not complex at the same time.
+
+How did you split your commits, and why that way?
+I asked claude to do this split
+
+What did your review catch — or confirm was already fine?
+Everything was already fine